Automobile magneto contact



W. E. McCREARY.

AUTOMOBILE MAGNETO CONTACT APPLICATION FILED DEC-2311916.

Patented Aug. 12, 1919.

@Mor/Meg WALTER E. MCCBEABY, F ALTQGNA, PENNSYLVANIA` AUTOMOBILE MAGNETO CONTACT.

Spectticatlon o( Letters Patent.

Patented Aug. 12, 1919.

Application tiled December 23, 1916. Serial 110,138,639.

To all 'whom it may concern:

f Be it known that I Waifriza E. McCuizaiir, a'cit-iz'en of the United State residing at. Altoona, in the county of Blair and State of Pennsylvania, have invented v certain new Aand useful Improvements in Automobile 1 Magneto Contacts, of whichthe followingis a specification.

This invention relates toielectrical contact devices and more particularly has ccial 'reference to a magneto contact for te ignition system of Ford automobiles. V-

Primarily, 4the object'of the invention is to provide improved means for collecting the current generated by the magneto which is huilt in the ily-wheel and fi-oin which a Y low tension alternating current flows thron h the primary `windings of the coil, usual y positioned on the dash, -to the coninnitator, which is located in front. of the engine, and thence back through the frame of the car to the magneto, tocoinplete the primary circuit. Current Howing through the primary windings of the coils induces a high tension current inthe secondary windings ofthe coils, from which it Hows to the sparkplugs as each wires circuit. is 'coinplated bythe commutator.

Another objectuoi" this invention is to further increase the efficiency of the ignition systein of the Ford cai' liy providing a magneto contact device that is not susccptible of being rendered inoperative hy par ticles of brake hands, filier and oil heilig caught between the magneto cont-act point and the stationary windings on the magneto.

A further object, of this device is'to provide a contact point for the magneto which is so constructed thatI when the same is screwed into position in the fly-whecl casing, thc plate on the magneto coil to which one end ofthe magneto coil is secured is 'not disturbed or dislocated.

A still further object, of this device is to provide a simple, ellicient and practical method of renewing the magneto contact l point, since as they are now made, it is an arduous task to remove and replace one.

With. the aliove and other objects in vica7 which will more ,readily appear as the. na-

'ture offgthe invention is better understood,

fthe saine consists in the novel construction,

`combination and arrangement of parts herenaften innige-fully described, illustrated and claimed.

l will be quite readily understoodV by,

plug those skilled in the art to which this invention belongs that the saine is susceptible of changes in the construction and manufacture without departing 'from the spirit oi' scope of the invention, hut a preferred and iractical embodiment of the invention is 'illustrated in'the acconi|ninying drawings,

in whichli Figure 1 shows a partial side elevation of 65 the Ford inotor with niy improved magneto positioned therein. I

lig. 2 is-a sectional view taken on the nline 2-2 ofFig. 1,' illustrating the construction of the magneto as well as the post tion of the improved magneto contact.

Fig. 3 shows a sectional view of the. iniproved magneto contact` and also shows its operative relation with the stationary part of the magneto.

Fig. 4 shows an elevational vi'ew of the improved magneto contact.

Fig. 5 shows the. front and side views of the magneto contact plate which is adapted to he secured to the niagueto case, hy suitable. screws or other means.

Similar referei'ce characters designate corresponding parts throughout the several tiguies of the drawings.

In a lying this invention to the Ford autonioiile engine, no change is contenii ,rotates with the ily-wheel while the other is securely fastened to the motor or transmis- .sion case. That portion of the magneto which revolves with the {1y-wheel 11 consists of a series 4of sixteen magnets 12, so positioned on the Hy-whcel 11 that the magnet poles of opposite kind are adjacent and held in place by a common clamp.

Since these various magiiiits revolve at `the saaie speed as the motor, these inagnets pass the stationary coils 13 and create therein an alternating low tension current, which is carried from these coils to the magnet contact. designated in its entirety by the numeral 14. The manner and means of collecting this current has been one source ,pf ignition trouble with this type of car for theplate.

coil terminal some time, due principally toV particles of brake band liber being:r caught between the plate 15 and the magneto contact point 16.

`he present whereby the particles of brake band-'fiber will not have any etlect upon the contact point with the coil terminal, and to'thisend, the invention contemplates the removal of the present pointed contact piece and provides` in its stead alleft;` hand wound helical spring 17, of which is ground so as to rest `tirluly on Thus, nieces of brake band fiber carried up by t caught, by the coils of the spring, be dcected awa y of its persisting lesiliency, not he disengaged from the result that the current {low in the primary coils.

plate 15 with the In the manufacture of this magneto-cone; drawn brass rod .18 and tact, I take a cold upsetor slightly increase the diameter as at -1Sl, below which Ireduco the diameter and out to such a length that when draw the wirel coiled the helical spring 17 is the result, A

I prefer to coil this spring left handed, which eliminates any tendency of the end of the coil from damaging the coil plate 15 to.

which one terminal of the. magneto coil is secured, 'while the opposite terminal end thereof is grounded on the frame.

Having thus constructed the helical spring l I further thread the topi; 20 of the rod after which I pass the rod from the rod 18,

through a properly constructed conical insu- 4 lating sleeve 21, which has aY socket at its lower end to snugly receive the enlarged abutment portion when the nuts -22 are drawn down the rod will not pull through t-he tube 21. Around the conical portion of the tube 21, I provide invention -provides 'means y Vcrly the plate engagingend.A

from the magnets and because the spring will ;-',constru'etipn .of

s uninterrupted.Tv

19 of the rod lsuch that a separate insulatin body or casing 23, which is adapted to i@ clamped between a top washer 2l and a hexagonal wrench enga ing member 25.

n applying this magneto contact, I prefer to use an'adapter plate 26, lwhich is `prop\ threaded to receive the threaded neck 27- of the member 25, together 'with cated screw holes 28 thro h suitable screws 29, for securing which pass l the plateto the transmission case 30.-.: f. H

This' cnstrl'xction obviat the dilliculty that is likely to arise from thevsrews lie-- loosel in the transmission case througi numerous removals and replacements which;

tinud usage.

Furthermore, the integral this :impmvedl'mage tact, will V eurxgentf,betweengthe-magneto and the coils,

,thusmproring the ifnltion system" as well us to provides more` ependable part-of the Ford ignuien-system.,-5 l i Ielaimtf .1. l. A magneto contact device of the class describedconsistin -of a holding member having an interior s mulder; and an electrical conductorrod having an abutment portion properly' lowill obviously-oocur'with conl' w nl `I'lecessarilyfobviate the lossof aniy for engaging with said shoulder und 'a left- 'coiled helical spring contact terminal.

A magneto contact device of the class oonsistin described, l of a. holding memberhaving 'an inte jipr s ouldernnd an electrical conductor `r bevi therewith an enlargii gage 'said shoulder and a spring contact.

In testimony whereof I allix my signature` in the presence of two witnesses.

4 WALTER E. MCCREARY ivitnessem l N. E. GEB,

ALEX. Wxm.

y formed integrally. o portion to e11- oft-coiled` helical 

